2202 Bending Fatigue Strength and Surface Durability of High Strength Sintered Metal Gears

2013 ◽  
Vol 2013 (0) ◽  
pp. 264-267
Author(s):  
Takao KOIDE ◽  
Teruie TAKEMASU ◽  
Shinya ARIMA ◽  
Masaki YOSHIDA ◽  
Shinji YONEMURA
Keyword(s):  
Fatigue Strength ◽  
High Strength ◽  
Bending Fatigue ◽  
Sintered Metal ◽  
Surface Durability ◽  
Bending Fatigue Strength

2727 Effect of Rolling on Bending Fatigue Strength and Surface Durability of Sintered Metal Gears

2005 ◽  
Vol 2005.4 (0) ◽  
pp. 177-178
Author(s):  
Takao KOIDE ◽  
Takatoshi MAEMORI ◽  
Teruie TAKEMASU ◽  
Kazuya MORIGUCHI ◽  
Satoshi ODA
Keyword(s):  
Fatigue Strength ◽  
Bending Fatigue ◽  
Sintered Metal ◽  
Surface Durability ◽  
Bending Fatigue Strength

311 Effect of Density on Bending Fatigue Strength and Surface Durability of Sintered Metal Gears

2014 ◽  
Vol 2014.52 (0) ◽  
pp. _311-1_-_311-2_
Author(s):  
Shinji YONEMURA ◽  
Takao KOIDE ◽  
Teruie TAKEMASU ◽  
Atsutaka TAMURA
Keyword(s):  
Fatigue Strength ◽  
Bending Fatigue ◽  
Sintered Metal ◽  
Surface Durability ◽  
Bending Fatigue Strength

42CrMo Hard Surface Gear Intensity Tests and Modified Parameter Correction

2012 ◽  
Vol 246-247 ◽  
pp. 145-148
Author(s):  
Nai Gen Li ◽  
Nan Xu ◽  
Nian Jun Zhang ◽  
Meng Guo Zhu
Keyword(s):  
Fatigue Strength ◽  
Gear Tooth ◽  
Coincidence Degree ◽  
High Strength ◽  
Tooth Root ◽  
Bending Fatigue ◽  
Hard Surface ◽  
Basic Parameters ◽  
Bending Fatigue Strength ◽  
Research Intensity

Hard surface gears drive is considering mainly how to improve the tooth root bending fatigue strength and wear resistance of the teeth. Based on the analysis of sliding ratio, coincidence degree and the gear tooth root bending fatigue strength, basic parameters of gear can be modified to improve strength. Although these gears must be cut by the standard tools, high strength gears are needed in machinery. In this research, intensity experiments were conducted with 42CrMo modified and standard hard surface gears. Experiment results show that the improvements of 42CrMo gear parameters are effective and teeth strength is improved for the modified parameters of gears.

Residual Stress, Hardened Layer and Bending Fatigue Strength of Induction Hardened Sintered Metal Gears

2002 ◽  
Vol 2002.5 (0) ◽  
pp. 15-16
Author(s):  
Kouitsu MIYACHIKA ◽  
Takao KOIDE ◽  
Satoshi ODA ◽  
Naoki MOTOOKA ◽  
Keiichi UEMOTO ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Hardened Layer ◽  
Bending Fatigue ◽  
Sintered Metal ◽  
Bending Fatigue Strength

Improvement of Fatigue Strength of Hole Edge of Ultra-High Strength Steel Sheet by Punching Process Including Thickening

2016 ◽  
Vol 716 ◽  
pp. 428-434 ◽  
Author(s):  
Yohei Abe ◽  
Ken-Ichiro Mori ◽  
Ryota Kosaka
Keyword(s):  
Fatigue Strength ◽  
High Strength Steel ◽  
Steel Sheet ◽  
High Strength ◽  
Bending Fatigue ◽  
Hole Edge ◽  
Tensile Fatigue ◽  
Ultra High Strength Steel ◽  
Bending Fatigue Strength ◽  
Punching Process

The effect of the hole edge shape formed by a punching process including thickening on the fatigue strength of the hole of ultra-high strength steel sheets was investigated. The bending and tensile fatigue tests of the thickened hole edge were performed. For the bending fatigue strength, the high height of hole edge was effective because of high bending stiffness. Although the high tensile stiffness was important for the high tensile fatigue strength, the shape of hole edge was alternative. To increase both the bending and tensile fatigue strengths, a compressive process in rollover of hole edge was added for the thickened sheet having a high bending fatigue strength. It was found that the thickened and compressed hole edge of ultra-high strength steel sheet was effective in improving both the bending and tensile fatigue strengths.

scholarly journals 402 Effect of Induction-Hardening on Bending Fatigue Strength of Rolled Sintered Metal Gears

2006 ◽  
Vol 2006 (0) ◽  
pp. 127-128
Author(s):  
Takao KOIDE ◽  
Yusuke MATSURA ◽  
Teruie TAKEMASU ◽  
Kouitsu MIYACHIKA ◽  
Chiaki NAMBA ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Induction Hardening ◽  
Bending Fatigue ◽  
Sintered Metal ◽  
Bending Fatigue Strength

High-strength gears produced by powder metallurgical processes – KL500/93-2

2019 ◽  
Vol 72 (6) ◽  
pp. 723-728
Author(s):  
Fritz Klocke ◽  
Christoph Broeckmann ◽  
Christoph Löpenhaus ◽  
Alexander Bezold ◽  
Tim Frech ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Load Transfer ◽  
High Strength ◽  
Material Model ◽  
Tooth Root ◽  
Content Type ◽  
Bending Fatigue ◽  
Generating Method ◽  
Load Carrying ◽  
Bending Fatigue Strength

Purpose The purpose of this study is to optimize high-strength gears produced by powder metallurgical process and to provide a material model to predict the tooth root bending fatigue strength. Powder metal (PM) technology offers great opportunities for the reduction of the carbon footprint and improvement of the cost efficiency of gear production. PM gears can achieve flank load-carrying capacities comparable to wrought steel gears if the loaded volume is fully densified. Still, the tooth root strength is of particular importance. Design/methodology/approach The tooth root stresses can be minimized by optimizing the tooth root geometry. This usually leads to a target conflict, as fully optimized tooth root geometries cannot be manufactured by generating processes such as hobbing, generating-grinding or rolling. To use the increase in tooth root load-carrying capacity of fully optimized root geometry on PM gears, a non-generating method for surface densifying is needed. The shot-peening process is used as an alternative densification process for PM gears. The properties of both shot peened and cold-rolled PM gears are analyzed and compared. To quantify the effect of both manufacturing processes, the tooth root bending fatigue strength will be evaluated and compared to wrought gears. Findings From the fatigue strength perspective, a material model is developed, which is able to predict local endurable stress amplitudes. The model is gained through regression varying carbon content, density and size effect on bending specimens. Originality/value It is transferable to PM gears of the same material using a load transfer coefficient.

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